linux-kernel - Re: [PATCH v2 2/4] leds: Add driver for QCOM SPMI Flash LEDs

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Date:   Sun, 25 Apr 2021 22:19:28 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     Nícolas F. R. A. Prado 
        <nfraprado@...tonmail.com>, Dan Murphy <dmurphy@...com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, linux-leds@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Brian Masney <masneyb@...tation.org>,
        Luca Weiss <luca@...tu.xyz>,
        Russell King <linux@...linux.org.uk>,
        Georgi Djakov <georgi.djakov@...aro.org>,
        linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        lkcamp@...ts.libreplanetbr.org, andrealmeid@...labora.com
Subject: Re: [PATCH v2 2/4] leds: Add driver for QCOM SPMI Flash LEDs

Hi!

> >>>+#include <linux/kernel.h>
> >>>+#include <linux/module.h>
> >>>+#include <linux/spmi.h>
> >>>+#include <linux/of_device.h>
> >>>+#include <linux/device.h>
> >>>+#include <linux/types.h>
> >>>+#include <linux/string.h>
> >>>+#include <linux/mutex.h>
> >>>+#include <linux/sysfs.h>
> >>>+#include <linux/led-class-flash.h>
> >>>+#include <linux/regulator/consumer.h>
> >>>+#include <linux/delay.h>
> >>>+#include <linux/regmap.h>
> >>>+#include <dt-bindings/leds/leds-qcom-spmi-flash.h>
> >>
> >>Please sort includes alphabetically.
> >
> >No need to do that.
> 
> Keeping the includes sorted eliminates the risk of introducing duplicates
> and allows for faster lookup.
> 
> What gain is in having them unsorted?

It is not there is gain in them unsorted; it is that keeping sorted
order is not worth the effort.

> >>>+#define FLASH_SAFETY_TIMER		0x40
> >>
> >>Namespacing prefix is needed for macros, e.g. QCOM_FLASH*.
> >
> >No need for that in .c files.
> 
> In general it eliminates the risk of name clash with other subsystems
> headers.
> 
> And actually the prefix here should be QCOM_LED_FLASH to avoid ambiguity
> with flash memory. If you dropped the vendor prefix then you'd get
> possible name clash with led-class-flash.h namespace prefix.

I believe the cost (longer macro names) outweights the benefits here.

Best regards,
								Pavel
-- 
http://www.livejournal.com/~pavelmachek

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